Process of making terpene esters.



i f m 'may'concerm. I l v B kn wn A X S ALEXANDER. -SIiU' KOFF,'doct.or of 8.Borowaja,-.St.

' cess of Mar'hitacturin Esters of er ene Alcohols;and g l T p '10 tier; others tains to make and use th in heating "caused to separate out .upon sulfuric acid being added, the

I to required can be considerably reduced improved satisfactory result :with this process, itis portion of the latter,

STATES PATENT, QFF QE. 1

r LEXI'S EX- inna snunorr, orisfr. rn'ri nsnune, Russia. :raocnss or name mnrnnn 'nsrnns.

hil'osoph of St. Peters burg, Russ1a,'a suject ofqt eEmperor'of Russia,- and whoselposuofiice address is No.

etersburg, Russian Empll'e, have invented a new and useful Pro Ido herebydeclare that thefollowlng' 1s a full, clear,and' exact descri of my invention, whic 1 will. enab e skilledinthe art towhich it apper- I esa'me. .1 The present. inventionhas for. its object an process of manufacturing esters of te; ene alcohols from terpene's. i

well-known process for manufacturing esters of isoborneol from camphene's consists a mixture of camphene, glacial acetic acid and sulfuric acid. To obtain a" absolutely necessary that the mixture of the said three substancesconstitutes a perfectly homogeneous solution, Now this homoeneity can only be obtained by. applying a arge 'exc'ess of glacial acetic acid over the theoretical proportion thereof. The ground for this is that, though glacial acetic acid isa very efficient solvent for camphene, a large if only the theoretical proportion of said solvent is used, will be glacial acetic acid being thinned b this addition and itsdissolving power 1' need accordingly. Now I have discovered that in practicing saidprocess for manufacturing esters of isoborneol the large proportion of glacial acetic acid hitherwithout causing any separation of camphene or provoking other bad effects, by the addition of an unsaturated acid ofthe higher fatty series, for instance linoleic acid, linolenic acid, oleic acid, elaidic acid and isooleic acid.

The beneficial result obtained by the present invention may readily be grasped from the following statement. In theory, in order to dissolve 100 parts of camph'ene on]? 43.5 parts of glacial acetic acid are requiret in practice, however, from 200 to 300 parts of it must be applied. Now by adding for instance 50 parts oflinoleic acid the said quantity of from 200 to 300 parts of glacial acetic acidmay be reduced to 50 parts, that a s ammed 01' Letters I Patent. an e i -m; 4,1907. Serial in. 371,913.

saponified of an unsatu'rate series may be attributed to the property of into [Patented out. 6,1908.

is to say a propyo retic'al one. 3- ioreover, the linoleic acid used may; easily be reobtained from the mass resulting from the reaction, and re-used, :whereas the acetic acid will be lost entirely or recovered in the state of a is obtained by proceedin alcohols in order to pro two other esters in starting from terp'enes, for instance esters of borneol or esters of terpenyl from pinene, or esters of terpineol from dipentene or limomn. I v v f The effect brou ht about by the presence if acid of the big the said acids ofreadily transfer suite-acids when brought-together with sulfuric acid, and to th acids of being very e 'cient solventsjfor hydrocarbons.

-In practicing the present invention, .a mixture' of acetic ester and the esterof the un-' saturated acid of the higher fatty series 'used is obtained; this is, however, of no ractical consequence,because those esters lave no practical use other than for manufacturing means of an alcoholic potash ac and driving off the alcohol formed by means of a current of steam. Moreover, I have discovered thatother mineral acids may be substituted for sulfuric acid; for instance hydrochloric acid and nitric acid have proved to be good substitutes.

I Examples.

1. 100 arts of camphene are mixed with 50 parts oi lacial acetic acid, 50 parts of raw linoleic acitf fying linseed oil by means of steam) and 10 parts of sulfuric acid having 50 cr cent; this mixture is heated to centlgrade for about two hours and then diluted with water.

The reactions taking place may be repre-- sented by the following equations:

The raw mixture of acetate and linoleate of borneol may be used as such or purified in'= well-known manner by shaking it with an her fatty" roperty of such Suhio- (obtained for instance by saponirtion not far from the theo- Q very thin acid. A similar beneficial-result with other terpene the respective terpene alcohol and'both esters co gposing the product obtained bysulfuric aqueous solution of sodium carbonate, and driving off theremalnder of unaltered camphene by distillation:

2. 100 parts of rectified turpentine oil are 200 parts of linoleic acid and 50 arts of sulfuric acid having 50 degrees aum, the mixture is heated for about 2 hours to a temperature of from 40 to 50 centigrade when the further treatment is carried out as outlined in the 1st example. l

3. 100 arts of camphene are mixed with 50 )tllJS of glacial acetic acid, 50 parts of lino eic acid and 10 parts of ordinary hydrochloric acid, the mixture is heated for aboutv two hours up to 70 centigrade, when the further treatment is carried out as outlined in the 1st example.

Having fully described my invention, What I desire to claim, and secure by Letters Patent of the United States, is v 1. The described process 'of manufacturing esters of terpene alcohols which consists in preparing a solution of the terpene to be treated in a mixture of glacial acetic acid in less than theoretical uantity and an unsaturated acid of the hi her fatty series, adding a mineral acid, and heating the mixture, substantially as described.

2. The described process of manufacturing esters of terpene alcohols which conslsts 1n preparing a solution of the terpene to be treated in a mixture of glacial acetic acid in mixed with 200 parts of glacial acetic acid,

less than theoretical quantity and linoleic acid, adding a mineral acid, and heating the mixture substantially as described.

3. The described process of manufacturing esters of terpene alcohols which consists in preparing a solution of the terpene to be treated in a diixture of glacial acetic acid in less than theoretical uantity and an unsaturated acid of the hig 18R fatty series, adding chlorhydric acid and heating the mixture substantially as described.

- 4. The described process of manufacturing esters of terpene alcohols which consists in preparing a solution of the terpene to be treated in a mixture of glacial acetic acid in less than theoretical quantity and linoleic acid, adding hydrochloric acid and heating the mixture substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ALEXIS ALEXANDER fillUKOFF.

Witnesses:

H. A. LOVIAGUINE, EDW. WARSCIIEIDT. 

